What Causes Weak Muscles With Chest Pain & Headache?

hi i feel sluggish often, my muscles get weak easily, pressure in my left chest right by my breast, brain fog or slow in the head, dripping tingly feeling in head(upper left side) with slight headache once in a while on and off, random pains in my body once in a while in random spots, very irritable. i am getting enough sleep, iron, calcium, and protein. i dont excercise hardly ever though. what could this be?